Free DVD Authoring tool for MAC. Sizzle is a GUI/frontend for dvdauthor.
The x264 QuickTime Codec is a QuickTime Image Compression Component which uses the free, open source x264 H.264/AVC encoder. It can produce H.264 encoded video faster than the Apple-provided H.264, with more configurable options and better quality.
iSquint is an iPod/TV video conversion app for Mac OS X.
PiTiVi allows users to easily edit audio/video projects based on the GStreamer framework: Capture audio and video; mix, resize, cut, apply effects to audio/video sources
Diva is a project to build an easy to use, scalable, open-source video editing software for the Gnome desktop.
QTCoffee is a set of command-line Mac OS X utilities for manipulating QuickTime movies and other QuickTime readable media.